Find the Heir

Jauffre sends you to Kvatch to look for Septim's illegitimate child. Martin is a priest in the Chapel of Akatosh. Your job is to find him and bring him back to Weynon Priory. Fast travel to Kvatch to start your search.

When you arrive in Kvatch, Hirtel runs up to tell you that Daedra have overrun Kvatch and the entire town is a smoking ruin after an Oblivion gate opened. Talk to one of the towns folk who don't run off and ask about Savlian Matius. You'll be told that he's at the gate at the top of the road. Since he's the resident strong guy, run up there to learn more.

Once you get to the top, Savlian Matius draws his sword and orders you back to the encampment. Ask him about Martin when you get the chance. Apparently he led a troop to the Chapel of Akatosh and should be holed up there safely. Offer to help and Savlian will give you a new quest.